Teradata 数据定义

1.1 创建表的可选项

CREATE MULTISET TABLE table_1

                 ,FALLBACK, NO JOURNAL

                 ,FREESPACE = 10 PERCENT

                 ,DATABLOCKSIZE = 16384 BYIES

(field1 INTEGER);

1.2 字段定义

字段名：在同一数据库中必须唯一

字段或数据类型

CREATE TABLE emp_data

(employee_number INTEGER

,department_number SMALLINT

,job_code  INTEGER,

,last_name  CHAR(20)

,first_name VARCHAR(20)

,birthday DATE

,salary_amount DECIMAL(10,2)

CREATE TABLE emp_data

(employee_number  INTEGER  NOT NULL 

,last_name  CHAR(20)  NOT NULL WITH DEFAULT

,street_address VARCHAR(30)  TITLE "Address"

,city  CHAR(15)  DEFAULT "Boise"

,state CHAR(2)  WITH DEFAULT

,birthday  DATE  FORMAT  "mm/dd/yyyy" 

,salary_amount  DEC(10,2)

,sex  CHAR(1)  UPPERCASE

);

UPPERCASE(字母大小写不敏感，内部用大写字母存储)

CREATE TABLE emp_data

(employee_number INTEGER

<
4000
p>,department_number INTEGER   COMPRESS
);

CREATE TABLE employee_badge

(emp_id INTEGER  NOT NULL

                 CONSTRAINT primary_1 PRIMARY KEY

,id_badge_number INTEGER

                  CONSTRAINT unique_1 UNIQUE

,salary INTEGER

                   CONSTRAINT check_1 CHECK (salary>0)

,job_code INTEGER

                   CONSTRAINT ref_1 REFERENCES job (job_code)【定义employee_badge的job_code必须和job表中的job_code对应】

);

1.3表级约束定义

CREATE TABLE employee_badge

(emp_id  INTEGER NOT NULL

,id_badge_num  INTEGER NOT NULL

,salary  INTEGER

,job_code  INTEGER

,CONSTRAINT primary_1   PRIMARY KEY (emp_id)     

,CONSTRAINT unique_1  UNIQUE(id_badge_num)

,CONSTRAINT check_1  CHECK(salary >0 AND

            job_code         BETWEEN 100000 AND 499999)

,CONSTRAINT ref_1   FOREIGN KEY (job_code)

                                      REFERENCES  job(job_code));

1.4索引定义

CREATE MULTISET TABLE emp_data

,FALLBACK

,NO BEFORE JOURNAL

,NO AFTER JOURNAL

,FREESPACE = 30

,DATABLOCKSIZE = 10000 BYTES(

employee_number INTEGER NOT NULL

,department_number SMALLINT

                        CONSTRAINT dep_check

                         CHECK (department_number BETWEEN 100 AND 999)

                         REFERENCES Department(department_number)

,job_code INTEGER COMPRESS

,last_name  CHAR(20)  NOT NULL

,first_name  VARCHAR(20) 

,street_address VARCHAR(30) TITLE "Address"

,city CHAR(15) DEFAULT "Boise"

                            COMPRESS Boise

,state CHAR(2) WITH DEFAULT

,birthday DATE FORMAT 'mm/dd/yyyy'

,salary_amout DECIMAL(10,2)

,sex  CHAR(1) UPPERCASE

,CONSTRAINT emp_key

            PRIMARY KEY (employee_number)

)INDEX (department_number);